Patent GB-388616-A (GB)
Title: Improvements in or relating to graining machines
IPC: B41F17/00
Filed: 1932-05-25
Abstract: 388,616. Printing- machines. TENNANT, W. J., 111, Hatton Garden, London.-(Oxford Varnish Corporation; Empire Building, Detroit, Michigan, U.S.A.) May 25, 1932, No. 14862. [Class 100 (ii).] A graining-machine for producing grain patterns on panels &c. comprises a main graining-mechanism adapted to transfer a pattern to one surface of a blank, and a second graining-mechanism for transferring a pattern to another surface of the blank which is disposed at an angle to the first surface, the blank being maintained in the same relative position while it is transported from one mechanism to the other by a suitable conveyer. The main mechanism A comprises a pattern roller 15, Fig. 2, inked by a roller 17, and a transfer roller 16 which transfers the design to the main horizontal surface of the blank P<1>, fed forward frictionally by the roller 16 and the co-operating conveyer rolls 20. The roller 16 is driven frictionally bv the electrically-driven roller 15. The second mechanism B comprises two parts C, C<1>, Fig. 3, each having a vertical pattern roller 62 and a corresponding transfer roller 65 which are adjusted to grip the blank P, when pushed forward by the succeeding blank P<1>, and to feed it forward at a greater speed than that of the blank P<1>, at the same time transferring the required design to the vertical edges of the blank, which is meanwhile supported by conveyer rolls 212. Each of the removably-mounted pattern rollers 62 is supported at the lower end by a bearing boss 95, Fig. 6, and is held at the other end by a bearing bar 96 passing radially across the roll 62 and having a central boss 98 embracing the upper end of the shaft, the ends of the bar 96 being carried by rods 97, 82. The rollers 62 are inked from troughs 100 mounted beneath the rollers, ink being transferred thereto by rotating screws 105, through the cut-away surface 106 of vertical tubes 104 mounted on brackets 107, rotatable about the rods 97. The position of these tubes 104 can be varied by set-screws 109. Scrapers 125, 126 are provided for the rollers 62, 65, and are given a vertical reciprocating movement by means of a cam which causes rods engaging the under-side of the scraper bearings to move vertically up and down. The scrapers 125, 126 are pivoted on common shafts 129 and are moved from the roller surfaces by a hand-operated cam 142 against the action of a spring 146. The surplus ink removed from the rollers 62 is returned to the troughs by scrapers 235, carried by the rollers 62 and moving across the bottom of the receptacle 231, which collects the surplus ink. The rollers 65 are adjustable relative to the pattern rollers 62, being mounted in supportngframes, the tubular side members 70 of which are pivotally supported on shafts 67, while the other side members 73 rest on bosses 75. The rollers 62, 65 are pressed together by springs 85, the pressure being adjustable by a set-screw 83 which engages a projection 73<1> on the pivoted frame. A manually-operated cam 89 may be used to separate the rollers, and, when this is done, the scraper 126 is moved away from the transfer-roller by an arm 147 on the tubular member 70, which engages an arm 148 on the scraper mounting and thus forces the blade away from the roller. To accommodate blanks of different widths, the mechanisms C, C<1> are made adjustable by mounting the various rollers of each mechanism on a frame 51, Fig. 6, on which is mounted a depending lug terminating in an internally-screw-threaded member which engages a threaded rod 190. The rod 190 is mounted transversely of the direction of feed and is preferably made in two parts, one carrying a right-handed and the other a left-handed thread, the two parts being capable of being inter-connected, when desired. By rotating the rod 190 by means of a hand-wheel the two mechanisms C, C<1> can thus be brought to any desired relative position. The drive for the two mechanisms C, C<1> is obtained from a main shaft 154 driven by a motor 150. Splined to this shaft is a gear 161 for each mechanism which is carried by the depending lug embracing the screw-threaded rod 190. This gear meshes with a gear 166 fixed in relation thereto and carried by the shaft of the roller 62 so that the position of the two mechanisms can be adjusted without affecting the drive. The transfer rollers 65 are driven by a chain drive from the shafts 67, which are in turn driven through shafts 172 and their associated gearing from the main shaft 154 The height of the conveyer rolls 20, 212 may be varied for different thickness of blanks by mounting the rolls on frames 200, 210 which can be raised or lowered by rotating screws 202, 222 engaging threads on the frames. The length of the conveyer frame 210 is varied by forming the frame in two parts which slide over one another and can be locked in the desired position by nuts 220. The distance between the mechanisms A, B can be altered, and for this purpose the mechanism B is mounted on a frame which can be moved by means of a pinion 36 on the frame and a rack 37 on the common base 10 of the mechanism. The offset rollers may be dispensed with, the pattern rollers printing direct on to the surfaces of the blanks, and one of the units C, C<1> may be omitted and replaced by an ordinary backing roll or a vertical conveyer. Further, the units C, C<1> may be provided with adjustment devices permitting the graining- rolls of one or both of these units to be inclined from the vertical. The conveyer may be positively driven and may be as described in Specification 328,970, [Class 100 (ii), Printing processes &c.], and both the top and the bottom main surfaces of the blank may be grained simultaneously. A common power unit may be used for both mechanisms.